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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a368b2f5bec7b4a420b647c21f01858ce03635dec09a280f009354403ff62401' 
  AND token = '4HLdudlKjrssui7KxkEL8ept5n7Lz6O1ncCoP0BcBMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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