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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '058c4737c324c03ab792dbf18ea35a7467eea1a00a54241f29f03a009d0f00e6' 
  AND token = 'RloKajkLCjwJ7kWjvqtG58UMjjDOEfweoKl1L3sYQFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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