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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09af221dcad47e2c9e26c92579ec2a77dc5f631b707f387175726e7a43b94d8a' 
  AND token = '9Qnlopxf45RRfSZ2lWSTgeizlOBEY8VbTYYdw+kZ4/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00095

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}