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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '061106203b8d52d750e8083d16897924cc0955cbb06cf72c3ae7eea657a0f330' 
  AND token = 'fGxpV4DpOividJWDJB5rbu+MAIt5WrsxiTSusz8A688=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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