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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '835feca4129f1a390e0d40a40f1ac661c9ac0c558bd2fe7d119886365c0cff4e' 
  AND token = 'QETYxs5nWfYJN8ZcTPP/CLz3z155aUKIr3UEzvXic38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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