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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8963b5f35bb9cc789ea1aba15c286ca3b0058bd9df7f0e2119b29dcd8587cb' 
  AND token = 'khE/7rRzlXxPZYovOUb6EukHq7eZn9q/x5piB2mT7/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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