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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968e71c2680c541ea031274d2f11bc2d29d6a0e71a49a041c46d70142c026895' 
  AND token = '5qFmja6PLxvAGKkQ4Cy64Fq/g2e8zk/xgeEOJgNFuSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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