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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '100c86f2a74f35dc7ed77cc2e9de5be60c95f6d12f93202a6640d4506ad67db9' 
  AND token = 'Vers+mBndch/VvkmKOeWg8h3pTxPNfoJ6aWHQoGyb40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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