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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ca9172d208b5b35624b2389b9625ecf5d1fcc340b43d8e1776623d495182e5' 
  AND token = 'MCe9QmJjsDPG9CBBVsKkpxMJR7w0IaBWEZRK7nEw92o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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