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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50c8fb2a27ea012390535bec69973767ff8e74697529720f621ffb970c9cbe0f' 
  AND token = '03k23Qt7PDRUCmegHuAk+1pq18/UWkEZ5/UaF8rzDuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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