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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93cdc9534c1fa9fcfa5ee8d76e7f8921ebca67c1f8d1f9217b67e5d5b11b0b60' 
  AND token = 'POzmMsIT6IF08b7D9gsnnNzbdY7rqoMSdeVpYfh0PvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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