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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ec23ef5a02b411e062a28469e5f9154954d8774b3ca83e6257371479c208c5c' 
  AND token = 'ZU+304d+2zlXQ5yrj7JvfdPtiVbo0Ob1yI42L7JJQSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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