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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ab8a34866a619c388377c1af236579e99dd17c0e1b7f58a902a80bbfad71a8' 
  AND token = '0EqXr6xGWj7ILmQQq8+LwXq4t6M80UO1B1RtpnLtwTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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