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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47389dcb060c99c3e2238cdd78a60d9c66bdb3635411bb47dcb6f4305102d264' 
  AND token = 'TDRBSP3Niz3jLnChvWlHgYINhttgZ6J7vjesRiMF75U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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