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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92dff2f246fb0e47904693e5dc3ea18deb0eb9ddd19558a07b9f5c7f3b1de236' 
  AND token = 'kdb1B+XupRjvSi+EpjoafkByfV6c3olyMZlLCGli4jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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