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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd54a8e7e47283c2b57e19254df4f09d2afa9eb7ad71b7774c070e9c7d616cd6a' 
  AND token = 'pgm9xHkPVYnClmDptae64bGIA9vRMS16QdLSGUmnruE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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