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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa603e8b414413ac77a89e857574ab54782f205b64e936b9038171595832e975' 
  AND token = 'mmz4CQiNAA5HLToN1f5n9fZ4imNjnngkWgTBy3mO5jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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