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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1705b95ae7de9e91874a9f62be8d0cff6227ea7c6c692acfe12aa65b32e89ff3' 
  AND token = 'kzsdsp1lUocWDFHuxefaSYpgCGVULHNAQAATZgQuzns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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