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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e9fdaff4a95d3bf2a573331c80d4c18b2528fb29ab1c0332cf721c593bafc1' 
  AND token = 'rjOMhtqStQoxzWwg9BYKQH7rp/g2uKrY1GyRysiSWbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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