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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1daf0639ab299826d8644120a0f1cee55d34c75e2e66aef893c847b289225a58' 
  AND token = 'uBeSrJEVGI01SiJFr+t72tqCSVvJgPGkSmbLjtdl9po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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