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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd04bba27598f1f201a628169b4b49f3dc6d8a3dc0a36241d42bd20df6acb781e' 
  AND token = 'OEAJNlHDH4YJDu7a62R2ZCUWfk+4Q6jh87W+aU2C34Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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