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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fbb58006a86a1b7d4e1b8de526e690f6d34b479df76758e7243056fc8d9a6a4' 
  AND token = 'TPB+UWWbErYeMDsegcda69Z6uMORRtbjz/jXh6nKaQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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