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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0004f958a3f99e8d25249a5d0a8b1857b65bf11e7df0ad3989fa23aedc58fbb' 
  AND token = 'vNH1LuQs3jDEQqI/PqF9cy5rh34q+5hEkrO9A8JUJgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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