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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032a52f563d597dd88c0ee42a049cdd1cd6dae4a4cfa0a5a543104205107a5fd' 
  AND token = 'tn2+rMa4301ryhzldm+/VocU0dj9vJNHqlkTongQWbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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