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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff6ff928693d192aab02a3ea9f1dd7f4ddb7470016a80ef1dc37fd1daf959c3' 
  AND token = 'ppBg1MlabroqjVl2UvYe1zzArEopQJbzu+8WeigM0ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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