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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23cd07c6087b554c07269eb829484829704efa0d97fe52ed4e3c3b4ba6cd81c9' 
  AND token = 'NGBuzvBe0KtT3RYV0TjIri1mAmcE6EC4o65QuBUKd+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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