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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab75a5faf51dc006543b414397c0f8b5fc3a59a8da6a166f62937be6ec7e87a' 
  AND token = 'Ick7LXiwv1BaJiMADvDvNo5klW7DRs7HqxHlNGcYI2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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