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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c2e05afbfe881aef81b62d5380cdb6f9382e8e37a0512dd14f27b3f2ab578fb' 
  AND token = 'QT602hfVu+msf2rbEK2qP7n70kGKmxHhanYnJqg5M70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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