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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '577555353bf1e18104da0d862f2ab5e09711d150714936eaae54a1d1cc1f09fd' 
  AND token = 'GuKZgzLQeOdZ6y8iYulU8FkJqEV2WFx98SaO6hYNOQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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