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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abc1db04e57b74f8c032f5e31a9cf742e7519f79a7e0df1057a7de80b5b04ee9' 
  AND token = 'GkMLEJegSKywjJ+ai74l3BF9lkIM5ib/+Uo5Krm86Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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