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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98dc3327b9bcab691465266a5d384957ad1cd07bef28b1590a4ace6b0dfa7e89' 
  AND token = '3fcHBefVsO70Fk6bg6ljqG3snVkY1bgjoQDyqgGuxfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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