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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26b73f99d4f29205fcc4ea4575631cbf21f7a1c1dae4a688aa17d9b2266aeb6c' 
  AND token = 'kvVc8szu3EA4EMopSewTT2aa+6ZBSqPb07jNt3HjISY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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