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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de95e60ee01ba7e54dc41c11495d1bbb4f2d11f5f9ed2e0400500b23692d2dcd' 
  AND token = '0XGLaF/MwkeON4QVG7ZivO4qFFQ8JyUkwRe+uZ1nlwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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