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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bea22d5aa2d4d3af5b43e6598465d00ade4d4ea01ea824e9a899c726ff5c63e' 
  AND token = 'WGJ9gWaetqpzn2TmCZKqHweSmuiOfsbOGAXQI4HAjOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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