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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f47c6cfb536f1f23bf231647b098c275ea501c69f1e6d7cb8bb163134ef0ad4f' 
  AND token = 'ZdowP5hoiUfEYW5Gwyn05Isj1i5vFRAQnSB22muVs/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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