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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5952f5593ddf851817c502f3ffec989eebfa19ff9ef9cfb4937c02c57cb94486' 
  AND token = 'nhfuH5ukM0t36zaQK/cdlJy/Jf+1hOYAyBns3fI/F80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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