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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7237982a46c21d69aa1733441243122f1dbffc5d6e16d7da16a9686e24bb587c' 
  AND token = 'wGulhp0WpfD0DwzJdV5t8+3wdodk+LmkR4SheuZMWt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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