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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1bf8cad0db3e07f8ed3b2d0f38a6dd8f71e1344d1059ac4fabd90b9e6782dad' 
  AND token = 'P92BST6oosGOkvOx/QarjGBrIHK9BWN57cjvwc08vw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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