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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab0df6f401269fc33a371823ba86a259a1334ad02955e6213334cc46e21b373' 
  AND token = '4hgNbeFto7+tzEzXpxTYVHrQqoUSmnCzd1ydOgC/mh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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