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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf4d4a1c376e6ee9e2069247f62e016dd02ec46199d46f40d11dc9a43ce08aa' 
  AND token = 'Wxox1PBENxF4cIjy8FnyHxPnvz1hXlkBQVcycTiVCWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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