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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f604d76a3da452614391580537570fdca9b8e237e9ad5b4046c74ae6344b7719' 
  AND token = 'cG8u7V2hr7kkVLcrKxztD65SRuVoiu4YfGwOw5tD5p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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