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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ef41812eddd466d2d870d7492328770e6a79d83e753dedfa81850fabdd6007' 
  AND token = 'U9+/4TULwgLppYfkJDFXXM5j119ig3MsSj17Yi6gY5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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