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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3bb89638a51564ee03a01bebc629dbf614a9d62e30a674f13128bba37134a20' 
  AND token = 'E705ljrmg7KDRl0qJGqSpbIAF7XbLlSMLxOQ5lXON9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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