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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e816c9d581ff71fdb2e0cbf289cb0953ebeaf0f6d0ef0a2a17180af0ba254d' 
  AND token = 'nuEju0sowf3tksMZMFKUloWF2Elm9QNyAnvfRs+4ITY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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