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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e98b92892f9bced8eb0bcde4c12a756cb0b69d7c8888e6f8be4e4de331479d' 
  AND token = 'Ci1VzIAlQKv0CsGr561UwloCtXxepQ59whgUzqPRsqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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