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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5471473dd994f9160b2400af40e3ca9d21448f3de43deb6a4723f6ac72e874d' 
  AND token = 'gO2gKwXFEFeAPhNjk/EmN5FS9NafvIHeRA5whHyb1v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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