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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b575b4b0e1b16b21f16bd130f1c862a4437298d65bb13e130c8dd30a69bd46' 
  AND token = 'qUqMlNVreQZpbiIO71RdzgMlIOsfhUQge8rddkvBQB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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