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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48552b235be0310e92e564b83372577609fdab47c2e4d3a017d7d89101542aee' 
  AND token = '5aKSmkDzGx6ThsPcnwh7cxngm0rTRqt5jUatOlUJq/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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