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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3061fa8513c70eaf2718a7cf1678f21a4a6feb17706e90d824c0aaa6575c0e4' 
  AND token = 'dqAjuUB4PiR9dzkJg3TRu3yVR87iCYX3P8wkgCyQAP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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