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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '372faa8ac7c686b7acf29dc8053bfda7df271f4ef9c0b67af67092a111261127' 
  AND token = '6KC2q1LhbQXHk38mqcy0/2Tv1mj5WywPmwFPU9QNlQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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