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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ea9d6b17e4e7d52468db0bb5bb2e5cd019d55e4e628c0baa4386a1218a5582' 
  AND token = 'tsFpQtrcIDRxRkAZGXUiNzW2LK08plp0BmT/EjE55qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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