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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd88885c9da422f4fa915f36a7aa748fec57de4394c9d5fb633dc4ee84f848c9f' 
  AND token = 'BOcGldUW6nqDit2EhQjWhEr8gTJ/3+XGKqQNDtE3vdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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