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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04558deea29ebc647aa74a70c4d85446e5bc59a6efe666cae5cbb8bc673d660e' 
  AND token = 'KFwYHQLoBNH89Rg7PFVp3C6c4Kr/HvjKXPeA5o27Eno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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