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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa4d1ab918cf9456b9783e9759e84144549f940e224de2b7933c4b742f754fa' 
  AND token = '4ABwQafvkelDXhOR1k/Vg62+RXdUNf2BdIrLArSYWcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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