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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ec261f6d6c9d00ea060b7234fe2ed6348b37a79fa67c6acc28bb181f1755a6' 
  AND token = 'ZtlLtK2CueCMsM+op7rGsUwjz+ONvXYaCCRNrE6OA7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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