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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a852a5ebef615a6da01eeafe4ef650858ded5025d6f824d5e30dfda8d2af8f98' 
  AND token = 'zfZBPLVGkzfBJVlPLqKmAlJnYt91k50kqS5yFadwvRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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