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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40e4eec0688136280baef54f9a34f2816022d6fcbb8acfd913803988a7b72fd6' 
  AND token = 'hfbxHfpN9w+mQAts286SvSwBRp88Nk5fbcGVBXCP8yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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