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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a571e9c45431b8c2c8baffc15e2523e80ac35245a6cd3ca3e082bd55c04aad3' 
  AND token = 'OiymlE15NsExV9sQEH8emuijkwkVc3Ciw6Al4iQkGNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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