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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0360dde4d4ee10535aa0a2619534c4ff1e33cfbc28261c3364a45358cf517a4f' 
  AND token = 'jP3fdLqq08MWHQhfZSbWv7gFOzuXm6RbRY3Umgyffbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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