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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bdae8d7d97edbb1fe459c737b239546d85b47a6dd3e07f4399c6749a9e3db08' 
  AND token = 'qerdWvuzeO646lbuw3D4o+wCfg70a5BEEZ1QQ7SZzqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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