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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b76aec04cd9deec7ce034a7b79e187132236e6fe6e86c05f6ae90cfb58d8607' 
  AND token = 'BXK0SZkUEs5CFbgk6WoF5pIJpZwlmMhgnCJoRJIopEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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