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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6146a9db3f536934c0f9adabe44ffdf6120676a82b278c31dea637d7ce8a4b' 
  AND token = '6oO76gNouEkkx/5+6ACoOwlHbxPNFolsjAzMMMV49ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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