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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bdc2160f8d6c3c1b6da233be8ac4ab0c2df794a5fb046356f3f15e213bb1afb' 
  AND token = '+fQJ4VqlDvUXQr7awTj8gS4sUxUKb0vIKzRauM4tEc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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