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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eeb77890fa1b117d71527ba5232d16b02d9ee0c88e1f10f18bc96f64e84cf33' 
  AND token = 'h3cHrQr391PjRjUSAoS6fvBqBVeCAMVpfCPeJBvib6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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