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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5431711d4194f6e5ad485351867a3be041aae80793ed195e664820b5bb2a38' 
  AND token = 'rIBF4C9bGQhQ3jKwgC5hgswogkLYctAex5MH4ato6HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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