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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '723242c28b5b3944f1d1630f8207e2d066a3aa9b4578c141032ad884c6ce5bfe' 
  AND token = 'qBHVsUlbfp1SoX145nkY8zgGtLQ9dqNBEyiGXxM03jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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