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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf9ad12d3f6ec3d93aef358d9fc6aa4eced587082999c91518c25192497dfbd' 
  AND token = 'lO/Tlqrl3bbtmj60MSj57HQ892Pz68lnpUagLe6c4zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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