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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a63e73a7ad1ee42839d98d373b30dac5c4dd3ff3ae1814524ef4ba02789e48d' 
  AND token = 'AvY1aUGNL58GlxJdShWGZYmd8fqywj4fNa4i/RbVCf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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