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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb2e8c401dcf13074f0fb45ed7d48324f91715cbabee0abb11d7037078b88bb' 
  AND token = 'hL4PpW3pyqq4rU8tDfINhkeWHVqsyyBdhsUVuaL6zOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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