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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d29e39f4214a4ac12b304b412df0a1fabbe60c62f5617090c2fb439d239307b' 
  AND token = 'u2vh9OB/avzvHQHEvGTDFvIzRm2aNRojEsChTPE9Aw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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