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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b4dfc177ead91f80efecd4d7cd2711e3e1fa54b6aea0a6cbfa77f1708dabe9' 
  AND token = 'Gj5YD/ph9DzyS6x1HA5m3S7fUeOZ0UMAlXGArhhggRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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