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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'decad7f2d9aea8a52af8c04263b4179623a3bf96bc22a6ed05be4c32e16c4b36' 
  AND token = 'JqO1B2TLbxE9Fx5FoWzUCVfoNnNjlE4bIcavQfoxPH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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