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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee01bf9443f7c1bed594a99215054b4d37f3ce977764f88d20edc4ee59fb3c69' 
  AND token = 'S/Mgx4eFQ2Bana8Qqxr7G+KFTCKT5UH1C+xvnO3RU2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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