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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '637877a629b63d2d2e9e22cd3ecd73271f0607ad02f24db4ab18f028a4d73883' 
  AND token = 'qtugtm3QVsiz4Zq9kP6gzdX6xJhoMdwFwhtkYQTHvgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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