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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36985d907369401676648cdbb9321fdb48989034e342c2f0361718ccbb90211d' 
  AND token = 'V7jqtnxfW65RoNQge1dps52w0V+d1c6Y69NXNg9Kfbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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