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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15c57d3d038f9e6af914374fe10800c85ae9b370ea0a8575ca0e2f60f12a5b3a' 
  AND token = 'Fd6hWYapeJohunQZ2y5nXxcXDsnlft97lPIEuN7TNxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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