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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb8eda8c54195cd0e5454245a067218f98d9ab23e72cb277316188e5a25e90b' 
  AND token = '8w6efZo3jsmTQLcMFgiGQz6FgUUH6cTY43F4Axm/3SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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