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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae61a09e668bc6172d5da05f47aec8cd65768f8d1559c881cc6e0062a4ab5dda' 
  AND token = 'fKyujb0JJhpj/f9A/Tep9pkyM74PDCEpstdgVJ06NEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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