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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0999f7f3867beffd88591a8f0f6175faa1e868a9f9819125c9d688abb6459f70' 
  AND token = 'ufCtz8tDJcv7HthuKsWViqxe+dIfHqHXUC8uVw+g5P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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