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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '823db9a622ce2d817ff2dc3871e2814e0a24b695a3e7b1065a952c801a63c48b' 
  AND token = 'eWepjutd1SnScEG5X797+eGFOl4DqZ512VCH8HB8dkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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