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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e771722c6f3a5362e796912158f54f7045ee696a1d26fb72029e9efc2c6b67' 
  AND token = '0fXfJqFrnJQ8rWRf8Nz/mdf1YXcdhS5xFsYtxXqKVek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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