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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b2bc8532d83bad1440e0e4371a74a3034aded6e7e0a1abfaa9b980b9c1a3cf' 
  AND token = 'A2aLKljcn0d6/qyOzBkSd5wvIfwO275WA7MIT0XwI3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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