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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e152285c30bbcc7150344601b45763641a70a204f94db0edb182ecebde1ca8a1' 
  AND token = 'WAnJZKkL0GktIHkZaH8t34/k+b4Yy3yVLIS3u0rPeGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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